Siemens SOMATOM Sensation Cardiac Version A60, Application Manual, Page: 57 / 128

57
Bolus Tracking
• After the Topogram is performed, the predefined
spiral scanning range and the optimal monitoring
position will be shown.
• If you need to redefine the spiral scanning range,
you should also reposition the monitoring scan in
order to keep the shortest start delay time (2 s).
(The distance between the beginning of the spiral
scanning range and the monitoring scan will be
the same).
• Move the monitoring scan line towards the opti-
mal position and release the mouse button, it will
be snapped automatically. (Trick: if you move the
monitoring scan line away from the optimal posi-
tion the “snapping” mechanism will be inactive).
4. Place an ROI in the premonitoring scan on the
target area or vessel used for triggering. (The ROI
is defined with double circles – the outer circle is
used for easy positioning, and the inner circle is
used for the actual evaluation). You can also zoom
the reference image for easier positioning of the
ROI.
5. Set the appropriate trigger threshold, and initiate
the contrast injection and monitoring scans at the
same time.
During the monitoring scans, there will be simul-
taneous display of the relative enhancement of the
target ROI. When the predefined density is reached,
the spiral acquisition will be triggered automatically.
6. You can also initiate the spiral any time during the
monitoring phase manually – either by pressing the
START button or by clicking the START key. If you
do not want to use automatic triggering, you can
deselect it.